diff --git a/README.rst b/README.rst
index f24aa59..6ce4d5f 100644
--- a/README.rst
+++ b/README.rst
@@ -99,3 +99,24 @@ You may source the new Python virtual environment during development:
  # source env/bin/activate.fish
  . env/bin/activate
 
+
+Python Pyramid Shell
+==========================
+
+If you want to use an interactive Python interpreter to interact with Make Post Sell app/models & DB:
+
+.. code-block:: bash
+
+ pshell development.ini
+
+.. code-block:: python
+
+ # begin the database transaction.
+ request.tm.begin()
+
+ # flush / commit all changes stored the the sqlachemy session.
+ request.dbsession.flush()
+
+ # commit/close the database transaction to really make changes.
+ request.tm.commit()
+
diff --git a/make_post_sell/routes.py b/make_post_sell/routes.py
index b6c3220..5d67a94 100644
--- a/make_post_sell/routes.py
+++ b/make_post_sell/routes.py
@@ -4,6 +4,8 @@ def includeme(config):
     config.add_route("robots", "/robots.txt")
     config.add_route("markup-editor-preview", "/markup-editor-preview")
 
+    config.add_route("ask-for-on-demand-tls", "/ask-for-on-demand-tls")
+
     config.add_route("home", "/")
     config.add_route("search", "/search")
 
diff --git a/make_post_sell/views/misc.py b/make_post_sell/views/misc.py
index f534ed1..fc920ea 100644
--- a/make_post_sell/views/misc.py
+++ b/make_post_sell/views/misc.py
@@ -5,8 +5,8 @@ from ..models.product import get_all_products
 # needed for favicon
 import os
 from pyramid.response import (
-  FileResponse,
-  Response,
+    FileResponse,
+    Response,
 )
 
 from make_post_sell.lib.render import markdown_to_html
@@ -29,29 +29,46 @@ def favicon_view(request):
 def robots_view(request):
     """Load and return either default robots.txt or version from .ini"""
     response = Response(
-        body=request.app.get(
-            "robots_dot_txt",
-            DEFAULT_ROBOTS_DOT_TXT
-        ).lstrip()
+        body=request.app.get("robots_dot_txt", DEFAULT_ROBOTS_DOT_TXT).lstrip()
     )
     response.content_type = "text/plain"
     return response
 
 
+@view_config(route_name="ask-for-on-demand-tls", require_csrf=False)
+def ask_for_on_demand_tls(request):
+    """
+    This implements Caddy ask protocol defined here:
+
+    * https://caddyserver.com/docs/caddyfile/options#on-demand-tls
+
+    Caddy will make an HTTP request to the given URL with a query string of ?domain= containing
+    the value of the domain name. If the endpoint returns a 2xx status code, Caddy will be authorized
+    to obtain a certificate for that name. Any other status code will result in cancelling issuance
+    of the certificate.
+    """
+    domain_name_requesting_tls = request.params.get("domain")
+    if domain_name_requesting_tls:
+        # "SELECT domain_name FROM mps_shop;"
+        result = request.dbsession.execute("SELECT domain_name FROM mps_shop;")
+        rows = result.all()
+        registered_domains = [r[0] for r in rows]
+        if domain_name_requesting_tls in registered_domains:
+            return Response(status_code=200)
+    return Response(status_code=401)
+
+
 # I set require_csfr to false because new browsers
 # don't save 3rd party cookies anymore.
 # This ajax endpoint should work whether a user is authenticated or not.
 @view_config(
-    route_name="markup-editor-preview",
-    renderer="string",
-    xhr=True,
-    require_csrf=False
+    route_name="markup-editor-preview", renderer="string", xhr=True, require_csrf=False
 )
 def markup_editor_preview(request):
     """AJAJ: Accept Markup data param, return HTML"""
     return markdown_to_html(request.params["data"], request.shop)
     # currently only supports markdown, but eventually we could support others.
-    #try:
+    # try:
     #    return markdown_to_html(request.params["data"], request.shop)
-    #except:
+    # except:
     #    return "we could not create markdown to html preview."